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Ive just finished copying the patent application for the Lockwood/hiller valve less pulse-jet. Its a word file so its not too big. I did my best to copy it exactly how it was but some words were difficult to make out but i think i got it almost completely right.
Click on the link below to download the file.
Download patent NOW!!!!! The information below has been taken from the patent application and init it describes how the valveless pulse jet works
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As explained in Lockwood patent no. 3,206,926 a pulse jet engine is a relatively simple structure essentially comprising an elongated hollow tube open at its ends and turned upon itself into a generally u-shaped configuration with the open ends thereof facing the same direction. Such tube is sometimes referred to as a combustor, and intermediate the ends thereof, fluid fuel is introduced into the engine through a nozzle structure located at a section of the tube generally referred to as the combustion chamber. A sparking device is also located at such combustion chamber, and in operation of the engine, both fuel and air, the latter in sufficient volume to create a combustible mixture with the fuel, enter the combustion chamber and the sparking device is energized to ignite the mixture. Upon ignition of the mixture, the consequent expansion of the gases within the combustion chamber results in a gaseous discharge through the open ends of the engine producing thrust forces tending to propel the engine in a direction opposite to the direction of flow of the gaseous discharge.
Ignition of the fuel within the combustion chamber is accompanied by a rapidly increasing gaseous pressure therein which rises to a value tending to interrupt fuel expression form the nozzle. As the combustion gases expand outwardly from the combustion chamber for discharge through the open ends of the engine, the pressure within the combustion chamber progressive decreases until a value is reached at which a charge of fuel sprays from the nozzle and a reverse flow of the gases toward the combustion chamber is initiated. Such reversal of flow direction results in ambient air being drawn into the combustion chamber for admixture with the fuel charge therein. The combustible mixture of fuel and air is then ignited and the cycle of operation is repeated. The sparking device can be de-energized once the engine commences to run because ignition of the combustible fuel air mixture is caused by the temperatures attained in the combustion chamber
The actual patent gives you all the infomation you should need to build your own valveless pulse-jet jst make sure you do all the calculations correct and you should get it right! ;)
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